How does PLCAMP sort modes to be sure a mode is plotted consistently by the same line? How does it determine whether the whirl is backward or forward?

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How does PLCAMP sort modes to be sure a mode is plotted consistently by the same line? How does it determine whether the whirl is backward or forward?

How does PLCAMP sort modes to be sure a mode is plotted consistently by the same line? How does it determine whether the whirl is backward or forward?

Tagged: 13, Mechanical APDL (f. ANSYS), rotordynamics, structural-dynamics, structural-mechanics

- June 5, 2023 at 7:04 am
  
  FAQ
  Participant
  
  A correlation matrix for the modes is computed using RSTMAC to sort the modes. To determine the whirl of a rotating structure we do the following. At each node we calculate the cross-product between the displacement vector and the derivative of the displacement vector. Then we compare it to the spin. We calculate a global whirl by taking an average of all the “nodal” whirls.

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Structural Dynamics

How does PLCAMP sort modes to be sure a mode is plotted consistently by the same line? How does it determine whether the whirl is backward or forward?

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